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      1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "ash/system/tray/throbber_view.h"
      6 
      7 #include "ash/system/tray/tray_constants.h"
      8 #include "grit/ash_resources.h"
      9 #include "ui/base/resource/resource_bundle.h"
     10 #include "ui/compositor/layer.h"
     11 #include "ui/compositor/scoped_layer_animation_settings.h"
     12 
     13 namespace ash {
     14 namespace {
     15 
     16 // Time in ms per throbber frame.
     17 const int kThrobberFrameMs = 30;
     18 
     19 // Duration for showing/hiding animation in milliseconds.
     20 const int kThrobberAnimationDurationMs = 200;
     21 
     22 }  // namespace
     23 
     24 SystemTrayThrobber::SystemTrayThrobber(int frame_delay_ms)
     25     : views::SmoothedThrobber(frame_delay_ms) {
     26 }
     27 
     28 SystemTrayThrobber::~SystemTrayThrobber() {
     29 }
     30 
     31 void SystemTrayThrobber::SetTooltipText(const base::string16& tooltip_text) {
     32   tooltip_text_ = tooltip_text;
     33 }
     34 
     35 bool SystemTrayThrobber::GetTooltipText(const gfx::Point& p,
     36                                         base::string16* tooltip) const {
     37   if (tooltip_text_.empty())
     38     return false;
     39 
     40   *tooltip = tooltip_text_;
     41   return true;
     42 }
     43 
     44 ThrobberView::ThrobberView() {
     45   throbber_ = new SystemTrayThrobber(kThrobberFrameMs);
     46   throbber_->SetFrames(ui::ResourceBundle::GetSharedInstance().GetImageNamed(
     47       IDR_AURA_CROS_DEFAULT_THROBBER).ToImageSkia());
     48   throbber_->set_stop_delay_ms(kThrobberAnimationDurationMs);
     49   AddChildView(throbber_);
     50 
     51   SetPaintToLayer(true);
     52   layer()->SetFillsBoundsOpaquely(false);
     53   layer()->SetOpacity(0.0);
     54 }
     55 
     56 ThrobberView::~ThrobberView() {
     57 }
     58 
     59 gfx::Size ThrobberView::GetPreferredSize() const {
     60   return gfx::Size(ash::kTrayPopupItemHeight, ash::kTrayPopupItemHeight);
     61 }
     62 
     63 void ThrobberView::Layout() {
     64   View* child = child_at(0);
     65   gfx::Size ps = child->GetPreferredSize();
     66   child->SetBounds((width() - ps.width()) / 2,
     67                    (height() - ps.height()) / 2,
     68                    ps.width(), ps.height());
     69   SizeToPreferredSize();
     70 }
     71 
     72 bool ThrobberView::GetTooltipText(const gfx::Point& p,
     73                                   base::string16* tooltip) const {
     74   if (tooltip_text_.empty())
     75     return false;
     76 
     77   *tooltip = tooltip_text_;
     78   return true;
     79 }
     80 
     81 void ThrobberView::Start() {
     82   ScheduleAnimation(true);
     83   throbber_->Start();
     84 }
     85 
     86 void ThrobberView::Stop() {
     87   ScheduleAnimation(false);
     88   throbber_->Stop();
     89 }
     90 
     91 void ThrobberView::SetTooltipText(const base::string16& tooltip_text) {
     92   tooltip_text_ = tooltip_text;
     93   throbber_->SetTooltipText(tooltip_text);
     94 }
     95 
     96 void ThrobberView::ScheduleAnimation(bool start_throbber) {
     97   // Stop any previous animation.
     98   layer()->GetAnimator()->StopAnimating();
     99 
    100   ui::ScopedLayerAnimationSettings animation(layer()->GetAnimator());
    101   animation.SetTransitionDuration(
    102       base::TimeDelta::FromMilliseconds(kThrobberAnimationDurationMs));
    103 
    104   layer()->SetOpacity(start_throbber ? 1.0 : 0.0);
    105 }
    106 
    107 }  // namespace ash
    108